Born Randall James Zwinge in 1928, Randi began performing as a teenager in the 1940s, touring with a carnival and working table to table in the nightclubs of his native Toronto. Billed as The Great Randall: Telepath, he had a mind-reading act, and also specialized in telling the future. In 1949 he made local headlines for a trick in which he appeared to predict the outcome of the World Series a week before it happened, writing the result down, sealing it an envelope and giving it to a lawyer who opened and read it to the press after the series concluded. But no matter how many times he assured his audiences that such stunts were a result of subterfuge and legerdemain, he found there were always believers. They came up to him in the street and asked him for stock tips; when he insisted that he was just a magician, they nodded — but winked and whispered that they knew he was truly psychic. Once he understood the power he had over his audience, and how easily he could exploit their belief in the supernatural to make money, it frightened him: “To have deceived people like that . . . that’s a terrible feeling,” he said.He turned instead to escapology — as The Amazing Randi: The Man No Jail Can Hold — and feats of endurance. He broke a record for his 55-minute stint encased in ice, and bested the time his hero Houdini had spent trapped in a coffin on the bottom of the swimming pool at the Hotel Shelton in Manhattan. But Randi never forgot the believers, and how susceptible they were to exploitation by those who lacked his scruples. And so, as his reputation as a magician grew, he also began to campaign against spiritualists and psychics. In 1964, as a guest on a radio talk show, he offered $1,000 of his own money in a challenge to anyone who could show scientific evidence of supernatural powers. Soon afterward, he began broadcasting his own national radio show dedicated to discussion of the paranormal. He bought a small house in Rumson, N.J., and installed a sign outside that announced randi — charlatan. He lived there alone, with a pair of talking birds and a kinkajou named Sam. Although Randi had known he was gay since he was a teenager, he kept that to himself. “I had to conceal it, you know,” he told me. “They wouldn’t have had a known homosexual working in the radio station. This was a day when you had to keep it completely hidden.”During the late ’60s and early ’70s, popular interest in the paranormal grew: There was a fascination with extrasensory perception and the Bermuda Triangle and best sellers like “Chariots of the Gods,” which claimed Earth’s ancient civilizations were visited by aliens. There were mystics, mind-readers and psychic surgeons, who were said to be able to extract tumors from their patients using only their bare hands — and without leaving a mark. Randi continued on his crusade. Few of his fellow illusionists were interested in exposing the way that conjuring tricks were used to dupe gullible audiences into believing in psychic abilities. “Everybody else just kind of rolled their eyes,” Penn Jillette, a good friend of Randi’s, told me. “'Why is Randi spending all this time doing this? We all know there is no ESP. It’s just stupid people believe it, and that’s fine.’ ”